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Maybe a more useful application would be to use the panels to run air conditioning and keep the car cool in a hot parking lot.

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Prius has had that for a decade: https://blog.toyota.co.uk/solar-powered-ventilation-prius

It is hugely helpful. My car is still very hot on hot days, but I'm no longer being burned quite as easily by my steering wheel, belt buckle, seat, etc.

The difference is quite noticeable. Especially on days/mornings/etc where it's relatively cool but the sun is hot. The air circulation really does wonders.

That runs only the fan, I seriously doubt that Toyota micro panel can handle aircon

The amount of power required for that is already so easily provided by the existing battery storage in an EV with very minimal impact to the range. I don't see how it could be worth the cost or effort.

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